共查询到19条相似文献,搜索用时 218 毫秒
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夏薇;张盛华;廖小平;罗斌 《中国塑料》2009,23(10):60-63
针对大型注塑件多点进料产生的熔接痕问题,本文综合应用热流道技术与自动控制技术,分析热流道阀式浇注机理与充填模式,研究了阀式浇注系统的关键技术和设计控制方法。通过模拟仿真某汽车前保险杆注塑件的阀式浇注过程,探讨了如何利用Moldflow软件进行阀式浇注系统设计的一般过程和步骤,取得了较理想的效果。 相似文献
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热流道时序阀浇口消除熔接痕研究 总被引:1,自引:1,他引:0
通过研究注塑件熔接痕的形成机理,阐述了热流道时序阀浇口对熔接痕的控制原理.以某轿车后保险杠注射成型为例,用CAE软件对充填过程进行模拟.结果表明,采用阀浇口时序控制技术不仅能很好地控制保险杠中的熔接痕,而且还能优化其它生产工艺,对保险杠的生产具有实际意义. 相似文献
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为了消除空调导风板的熔接痕,以某空调导风板为研究对象,利用Moldflow模拟软件对其进行数值模拟。模拟结果表明,采用传统多浇口浇注时,空调导风板塑件表面易产生熔接痕缺陷,严重影响塑件的外观。采用顺序注射成型方法浇注,通过在原有热流道上安装可以由阀门装置软件独立控制的液压回路,实现多浇口顺序控制。经过方案优化,确定了3浇口的开启顺序和顺序开启时间,消除了空调导风板表面的熔接痕并改善了其表面的分子取向,提高了塑件的整体质量。将优化方案应用于生产实践中,满足塑件外观及性能需要。 相似文献
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基于阀式浇注技术的注塑件熔接痕控制 总被引:5,自引:0,他引:5
通过对注塑件熔接痕形成机理的研究,阐述阀式浇注技术对熔接痕的控制原理,以注射成型某平板为例,将其模具浇注系统的流道设计为热流道,并采用阀式浇注,采用CAE软件对充填过程进行模拟。结果表明,采用阀式浇注技术对控制熔接痕取得了较好的效果。 相似文献
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Scott Weir 《乙烯基与添加剂工艺杂志》1994,16(4):231-234
Surface defects in injection molded PVC parts have long been analytically unpredictable. These defects are typically caused by thermal instability and flow instability of the material. There exists a need to analytically predict these defects through the use of mold filling simulation. This paper documents an experimental approach to predicting surface defects on injection molded PVC parts through the use of material characterization, mold filling simulation correlation, and verification tests. 相似文献
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Takaaki Matsuoka Jun-Ichi Takabatake Akihiko Koiwai Yoshinori Inoue Satoru Yamamoto Hideroh Takahashi 《Polymer Engineering and Science》1991,31(14):1043-1050
Injection molding analysis programs were developed for CAE (Computer Aided Engineering) in injection molding of thermoplastics. The programs consist of mold cooling, polymer filling-packing-cooling, fiber orientation, material properties and stress analyses. These programs are integrated to predict warpage of molded parts by using a common geometric model of three dimensional thinwalled molded parts. The warpage is predicted from temperature difference between upper and lower surfaces, temperature distribution, flow induced shear stress, shrinkage, and anisotropic mechanical properties caused by fiber orientation in the integrated simulation. The integrated simulation was applied to predicting warpage of a 4-ribbed square plate of glass fiber reinforced polypropylene for examination of its validity. Predicted saddle-like warpage was in good agreement with experimental one. 相似文献
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A numerical simulation is presented that combines the flow simulation during injection molding with an efficient algorithm for predicting the orientation of short fibers in thin composite parts. Fiber-orientation state is represented in terms of a second-order orientation tensor. Fiber-fiber interactions are modeled by means of an isotropic rotary diffusion. The simulation predicts flow-aligned fiber orientation (shell region)near the surface with transversely aligned (core region) fibers in the vicinity of the mid-plane. The effects of part thickness and injection speed on fiber orientation are analyzed. Experimental measurements of fiber orientation in plaque-shaped parts for three different combinations of cavity thickness and injection speed are reported. It is found that gapwise-converging flow due to the growing layer of solidified polymer near the walls tends to flow-align the fibers near the entrance, whereas near the melt front, gapwise-diverging flow due to the diminishing solid layer tends to lign the fibers transverse to the flow. The effect of this gapwise-converging-diverging flow is found to be especially significant for thin parts molded at slower injection speeds, which have a proportionately thicker layer of solidified polymer during the filling process. If the fiber orientation is known, predictions of the anisotropic tensile moduli and thermal-expansion coefficients of the composite are obtained by using the equations for unidirectional composites and taking an orientation average. These predictions are found to agree reasonably well with corresponding experimental measurements. 相似文献
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白庆平;池成忠;陈晓伟;张建刚 《中国塑料》2011,25(2):104-107
对比分析了新旧版塑料注射模模架国家标准,重点介绍了应用Pro/E布局文件和族表建立模架库以及模架调用的方法:先利用族表建立注射模零件库并创建模架布局文件,然后将相应模架组件声明到布局实现模架系列化以方便调用。 相似文献
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